SSH connect to a server via JumpHost

config

#   +-------+       +----------+      +-----------+
#   | Laptop| <---> | Jumphost | <--> | FooServer |
#   +-------+       +----------+      +-----------+

Host JumpHost
  User ec2-user
  HostName xx.xx.xx.01    
  # Add these 2 lines so we don't have to manually run 'ssh-add [key]'
  UseKeychain yes
  AddKeysToAgent yes
  ####################################
  IdentityFile ~/.ssh/keys/key.pem
 
Host FooServer
  User ec2-user
  HostName xx.xx.xx.02  
  ProxyCommand ssh JUMPBOX nc %h %p
  
# ALTERNATE METHOD USING FORWARD AGENT, SSH JumpHost_1 then SSH [email protected]
Host JumpHost_1
  User ec2-user
  HostName xx.xx.xx.01
  ForwardAgent yes
  IdentityFile ~/.ssh/keys/key.pem